Method for manufacturing semiconductor device with replacement gates
First Claim
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1. A method comprising:
- forming a first fin and a second fin on a substrate;
forming a dummy gate material over the first fin and the second fin;
patterning the dummy gate material to form a dummy gate structure;
forming gate spacers adjacent the dummy gate structure over the first fin and the second fin;
after patterning the dummy gate material and forming the gate spacers, forming an opening in the dummy gate structure between the first fin and the second fin;
forming a sacrificial oxide on sidewalls of the dummy gate structure in the opening, the sacrificial oxide being different than the gate spacers;
filling an insulation material between the sacrificial oxide on the sidewalls of the dummy gate structure in the opening;
removing the dummy gate structure and the sacrificial oxide;
depositing a gate dielectric layer over the first fin, over the second fin, and over the insulation material;
forming a metal over the gate dielectric layer; and
planarizing top surfaces of the metal, the gate dielectric layer, and the insulation material to form a first gate electrode over the first fin and a second gate electrode over the second fin.
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Abstract
A semiconductor device and method includes: forming a first fin and a second fin on a substrate; forming a dummy gate material over the first fin and the second fin; forming a recess in the dummy gate material between the first fin and the second fin; forming a sacrificial oxide on sidewalls of the dummy gate material in the recess; filling an insulation material between the sacrificial oxide on the sidewalls of the dummy gate material in the recess; removing the dummy gate material and the sacrificial oxide; and forming a first replacement gate over the first fin and a second replacement gate over the second fin.
23 Citations
20 Claims
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1. A method comprising:
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forming a first fin and a second fin on a substrate; forming a dummy gate material over the first fin and the second fin; patterning the dummy gate material to form a dummy gate structure; forming gate spacers adjacent the dummy gate structure over the first fin and the second fin; after patterning the dummy gate material and forming the gate spacers, forming an opening in the dummy gate structure between the first fin and the second fin; forming a sacrificial oxide on sidewalls of the dummy gate structure in the opening, the sacrificial oxide being different than the gate spacers; filling an insulation material between the sacrificial oxide on the sidewalls of the dummy gate structure in the opening; removing the dummy gate structure and the sacrificial oxide; depositing a gate dielectric layer over the first fin, over the second fin, and over the insulation material; forming a metal over the gate dielectric layer; and planarizing top surfaces of the metal, the gate dielectric layer, and the insulation material to form a first gate electrode over the first fin and a second gate electrode over the second fin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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forming a first fin in a first region of a substrate and a second fin in a second region of the substrate; forming a first isolation region on the substrate, the first isolation region surrounding the first fin and the second fin; forming a dummy gate material over the first fin and the second fin; depositing gate spacers along sides of the dummy gate material; after depositing the gate spacers, forming an opening in the dummy gate material, the opening exposing the first isolation region and sidewalls of the gate spacers; forming a sacrificial oxide in the opening on sidewalls of the dummy gate material; filling an insulating material in the opening between the sacrificial oxide on the sidewalls of the dummy gate material; removing remaining portions of the dummy gate material and the sacrificial oxide; and forming replacement gates over the first fin and the second fin. - View Dependent Claims (13, 14, 15, 16)
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17. A method comprising:
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forming a plurality of first fins in a first region of a substrate; forming a plurality of second fins in a second region of the substrate; depositing a dummy gate on the first fins and the second fins; depositing gate spacers along sides of the dummy gate; forming an inter-layer dielectric (ILD) adjacent the gate spacers; after forming the gate spacers and the ILD, etching an opening in the dummy gate between the first fins and the second fins; oxidizing sidewalls of remaining portions of the dummy gate exposed to the opening; forming a first isolation region along the oxidized sidewalls of the dummy gate in the opening, the gate spacers contacting sidewalls of the first isolation region and the ILD; removing the remaining portions of the dummy gate; after removing the remaining portions of the dummy gate, depositing a first gate dielectric on the first fins and along a first sidewall of the first isolation region; after removing the remaining portions of the dummy gate, depositing a second gate dielectric on second first fins and along a second sidewall of the first isolation region; and forming a first metal on the first gate dielectric and a second metal on the second gate dielectric. - View Dependent Claims (18, 19, 20)
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Specification